JP2007112159A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of blowing air-conditioned air having the same temperature as the front part of a vehicle cabin toward the rear part of the vehicle cabin, and improving amenity at the rear part of the cabin. <P>SOLUTION: A temperature difference door 14 is provided in the middle of an air passage 4, and flowing-in of a warm air to a rear passage 13 is prevented by a temperature difference door 14 in bent mode cooling. Cold air C1 is introduced to the rear passage 13, sent to a rear part blowout port 12, cold air C2 is mixed with the warm air W and sent to a bent blowout port 9. The temperature of the cold air C1 is decreased by endothermy while it flows through the rear passage 13, and the temperature of the cold air C1 becomes the same as the temperature of the cold air C2 blowing out from a bent blowout port 9. In foot mode heating, flowing-in of the cold air to the rear passage 13 is prevented, the warm air is send to the rear part blowout port 12, and the warm air is mixed with the cold air to send out to a foot blowout port 8. As the result, since the temperature of the warm air is decreased by radiation while it flows through the rear passage 13, the temperature of this warm air becomes the same as the temperature of the warm air blowing out from the foot blowout port 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner that supplies conditioned air at a predetermined temperature to the front and rear of a vehicle interior.

For example, as described in Patent Document 1, there is proposed a “vehicle air conditioner” in which the doors are arranged so that the air mix door and the vent door are arranged in a substantially straight line at the maximum cooling in the vent mode. ing. In this conventional technology, the cold air flows along the air mix door and the vent door arranged substantially in a straight line during the maximum cooling in the vent mode, and the cold air is blown out from the vent door to the front part of the vehicle interior. The pressure loss of the cold air flow path can be reduced, and the cooling capacity at the maximum cooling can be improved.
Japanese Patent Laid-Open No. 11-11135 (paragraph number 0022, FIG. 1)

  However, in the prior art described in Patent Document 1, the pressure loss of the cold air flow path can be reduced by the arrangement of the air mix door and the vent door, but the conditioned air is guided from the front part of the vehicle interior via the rear passage to the rear part. When the air is blown from the rear vent, heat loss occurs due to heat dissipation or heat absorption while flowing through the rear passage, so the temperature of the conditioned air blown to the rear of the passenger compartment is different from the temperature of the conditioned air blown to the front of the passenger compartment There was a problem of impairing comfort at the rear of the passenger compartment.

  For example, the temperature of the conditioned air measured at the entrance of a rear passage (duct) that guides the conditioned air from the front to the rear of the passenger compartment changes as shown by the broken line L1 in FIG. 14, whereas the rear passage (duct). The temperature of the conditioned air measured at the outlet changes as shown by broken lines L2 and L3 in FIG. That is, during the vent mode cooling, the temperature of the cold air rises due to heat absorption in the rear passage as indicated by a broken line L2 in FIG. On the other hand, at the time of foot mode heating, the temperature of the warm air decreases due to heat radiation in the rear passage as shown by a broken line L3 in FIG.

  The present invention has been made in consideration of the above-described prior art, and the purpose thereof is to blow out conditioned air at the same temperature as the front part of the passenger compartment to the rear part of the passenger compartment. It is providing the vehicle air conditioner which can improve.

  In order to achieve the above object, an air conditioner for a vehicle according to the present invention includes an air passage connected to a blower for blowing, an evaporator provided in the middle of the air passage, for cooling the passing air, and a downstream side of the evaporator. A heater core for heating, an air mix door that is provided between the evaporator and the heater core and adjusts the ratio of the air volume passing through the heater core and the air volume bypassed; and from the air passage to the front of the vehicle interior An air conditioner for a vehicle comprising a front outlet for blowing air, a rear passage branched from the air passage, and a rear outlet for blowing air-conditioned air sent through the rear passage to the rear of the passenger compartment. In addition, a differential temperature door that changes the amount of cold air introduced or the amount of hot air introduced into the rear outlet is provided in the middle of the air passage.

  In the present invention configured as described above, during cooling, the amount of cold air introduced into the rear outlet is changed by a differential temperature door provided in the middle of the air passage, for example, a relatively large amount of cold air is passed through the rear passage. While sending out to a blower outlet, cold air is mixed with the warm air heated with the heater core, and it sends out to a front blower outlet. As a result, the temperature of the cold air is lowered by heat absorption while flowing in the rear passage, so that the temperature of the cold air blown out from the rear outlet becomes the same as the temperature of the cold air blown out from the front outlet. In addition, a relatively large amount of hot air is sent to the rear outlet through the rear passage during heating, and the hot air is mixed with the cold air and sent to the front outlet. As a result, since the temperature of the hot air is reduced by heat radiation while flowing in the rear passage, the difference between the temperature of the hot air blown from the rear outlet and the temperature of the hot air blown from the front outlet can be reduced. Thereby, the conditioned air with a small temperature difference from the front part of the passenger compartment can be blown out at the rear part of the passenger compartment.

  In the vehicle air conditioner of the present invention, the conditioned air having the same temperature as that of the front part of the passenger compartment can be blown out to the rear part of the passenger compartment, so that the comfort in the rear part of the passenger compartment can be improved.

  Hereinafter, details of a vehicle air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing a vehicle air conditioner according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a state in which foot mode heating is performed according to the first embodiment, and FIG. FIG. 4 is a diagram showing the transition of the temperature of the conditioned air at the entrance of the rear passage provided in the embodiment, and FIG. 4 is a diagram showing the transition of the temperature of the conditioned air at the exit of the rear passage provided in the first embodiment.

  The vehicle air conditioner 1 according to the present embodiment is housed in an instrument panel 3 at the front of the passenger compartment 2, and is connected to a blower passage 4 connected to a blower blower (not shown) and in the middle of the blower passage 4. An evaporator 5 that is provided and cools the air in the air passage 4 through a refrigerant circulating in an external refrigerant circuit (not shown), and a heater core for heating that is disposed downstream of the evaporator 5 and uses engine coolant as a heat source 6, an air mix door 7 that is provided between the evaporator 5 and the heater core 6 and adjusts the ratio of the air volume that passes through the heater core 6 and the air volume that bypasses, and the air from the air passage 4 to the front of the vehicle compartment 2. A plurality of outlets 8, 9, 10 that blow out, a branch passage 11 that branches from the middle of the air passage 4, and a rear passage 1 that is connected to the outlet of the branch passage 11 and guides conditioned air to the rear outlet 12. When, a provided in the middle of the air passage 4, and a differential temperature door 14 to vary the cool air introduction amount or warm air introducing amount into the rear air outlet 12. Opening and closing doors 8a, 9a, 10a are provided at the outlets 8, 9, 10 at the front of the vehicle compartment 2, respectively. Of these, the foot outlet 8 blows conditioned air from the lower part of the instrument panel 3 toward the feet of the passengers in the passenger compartment 2, and the vent outlet 9 enters the passenger compartment 2 from the middle part of the instrument panel 3. The conditioned air is blown out, and the defroster outlet 10 blows out the conditioned air toward the windshield (not shown) from the upper part of the instrument panel 3. The rear outlet 12 is also provided with an opening / closing door 12a.

  The temperature difference door 14 is disposed in the vicinity of the upper end of the partition wall 15 that partitions the air passage 4 and the branch passage 11, and rotates in conjunction with the open / close doors 8a and 9a. For example, as shown in FIG. 1, when the open / close door 9a of the vent outlet 9 is opened, the temperature difference door 14 is rotated until it is aligned with the partition wall 15 so that the front end of the temperature difference door 14 is the partition wall. 15 is in contact with the upper end of 15. As shown in FIG. 2, when the open / close door 8 a of the foot outlet 8 is opened, the temperature difference door 14 is rotated to a position substantially orthogonal to the partition wall 15, and the temperature difference door 14 and the partition wall 15 are A gap is formed between the upper end.

  In the first embodiment, as shown in FIGS. 3 and 4, vent mode cooling is performed when the opening of the air mix door 7 is equal to or smaller than a predetermined reference opening D, and is equal to or higher than the predetermined reference opening D. The case where foot mode heating is performed is illustrated. Below the reference opening D, the temperature difference door 21 is in a closed position as shown in FIG. 1, and the temperature at the inlet of the rear passage 13 is indicated by a solid line L4 in FIG. It changes as follows. Above the reference opening D, the temperature difference door 21 is in the open position as shown in FIG. 2, and the temperature at the inlet of the rear passage 13 is indicated by the solid line L5 in FIG. It changes as follows.

  For example, during vent mode cooling, the open / close door 9a of the vent outlet 9 is opened as shown in FIG. 1, and in conjunction with this, the temperature difference door 14 is rotated to a state in which it is substantially aligned with the partition wall 15. The tip of the temperature difference door 14 contacts the upper end of the partition wall 15. As a result, a relatively large amount of cool air C1 that has passed through the evaporator 5 is guided to the branch passage 11 by the differential temperature door 14 and the inflow of the warm air W that has passed through the heater core 6 into the rear passage 13 is suppressed. After C1 is introduced into the branch passage 11, it is sent out to the rear outlet 12 via the rear passage 13. At the same time, the cold air C2 is mixed with the warm air W and sent to the vent outlet 9. As a result, the temperature of the cold air C1 at the inlet of the rear passage 13 is lower than that in the conventional case indicated by the broken line L1, as indicated by the solid line L4 in FIG. Next, while passing through the rear passage 13, the temperature of the hot air C <b> 1 rises as indicated by the solid line L <b> 6 in FIG. 4 due to heat absorption, and thus becomes the same as the temperature of the hot air C <b> 2 blown out from the foot outlet 8.

  Further, during foot mode heating, as shown in FIG. 2, the opening / closing door 8 a of the foot outlet 8 is opened, and in conjunction with this, the temperature difference door 14 rotates to a position substantially orthogonal to the partition wall 15. A gap is formed between the temperature difference door 14 and the upper end of the partition wall 15. Thus, a relatively large amount of warm air W1 that has passed through the heater core 6 is guided to the rear passage 13 by the differential temperature door 14 and the inflow of the cold air C that has passed through the evaporator 5 into the rear passage 13 is suppressed. After the wind W1 is introduced into the branch passage 11 along the temperature difference door 14, it is sent out to the rear outlet 12 via the rear passage 13. At the same time, the warm air W2 is mixed with the cold air C and sent to the foot outlet 8. As a result, the temperature of the warm air W1 at the entrance of the rear passage 13 is higher than that in the conventional case indicated by the broken line L1, as indicated by the solid line L5 in FIG. Next, while passing through the rear passage 13, the temperature of the warm air W1 decreases as shown by the solid line L6 in FIG. 4 due to heat radiation, so that the temperature difference from the temperature of the warm air W2 blown from the foot outlet 8 becomes small.

  In 1st Embodiment comprised in this way, the air conditioning wind with a small temperature difference with the front part of the compartment 2 can be blown out to the rear part of the compartment 2, and the comfort in the rear part of the compartment 2 is improved. Can do.

  FIG. 5 is a longitudinal sectional view showing a vehicle air conditioner according to a second embodiment of the present invention, FIG. 6 is a longitudinal sectional view showing a state in which foot mode heating is performed according to the second embodiment, and FIG. FIG. 8 is a plan view of a portion of the temperature difference door viewed from the direction A in FIG. 5, FIG. 9 is a perspective view of the temperature difference door, and FIG. FIG. 11 is a diagram showing the temperature of the conditioned air at the entrance of the rear passage provided in the second embodiment and the operating state of the differential door, and FIG. 11 is the temperature of the conditioned air at the outlet of the rear passage provided in the second embodiment. It is a figure which shows the operating state of a temperature difference door. 5 to 11, the same reference numerals are given to the same components as those in the first embodiment shown in FIGS. 1 to 4 described above. 6 and 7, although a part of the illustration is omitted, a rear passage 13 for guiding the conditioned air to the rear outlet 12 is connected to the outlet of the branch passage 11 as shown in FIG. FIG. 10A is a diagram showing the transition of the temperature of the conditioned air at the entrance of the rear passage, and FIG. 10B is a diagram showing the operating state of the temperature difference door. Similarly, FIG. 11A is a diagram showing the transition of the temperature of the conditioned air at the outlet of the rear passage, and FIG. 11B is a diagram showing the operating state of the temperature difference door.

  The vehicle air conditioner 20 of the present embodiment is different from the first embodiment shown in FIGS. 1 to 4 described above in the configuration of the temperature difference door 21 and the other configurations are basically the same. . That is, the differential temperature door 21 includes a rotation shaft 22 that is rotatably provided on the instrument panel 3 and a door panel 24 that is attached to the rotation shaft 22 and has an opening 23. The differential temperature door 21 is in the closed position as shown in FIG. 5 during the vent mode cooling, is in the open position as shown in FIG. 6 during the foot mode heating, and as shown in FIG. 7 in the defroster mode. Further, it is rotated to a position away from the partition wall 15.

  In the second embodiment, as shown in FIGS. 10 and 11, vent mode cooling is performed when the opening of the air mix door 7 is equal to or smaller than a predetermined reference opening D, and is equal to or higher than the predetermined reference opening D. The case where foot mode heating is performed is illustrated. Below the predetermined opening D1 on the COLD (low temperature) side from the reference opening D, the temperature difference door 21 is in the closed position as shown in FIG. The temperature at the inlet 13 changes as indicated by the solid line L7 in FIG. Above the predetermined opening D2 on the HOT (high temperature) side from the reference opening D, the temperature difference door 21 is in the open position as shown in FIG. The temperature at the inlet 13 changes as indicated by the solid line L9 in FIG. Further, between the predetermined opening degrees D1 and D2, the temperature difference door 21 shifts from the closed position to the opened position, and the temperature at the entrance of the rear passage 13 is indicated by a solid line L8 in FIG. 10 (a). Transition.

  For example, during vent mode cooling, the open / close door 9a of the vent outlet 9 is opened as shown in FIG. 5, and the temperature difference door 21 is closed in conjunction therewith. At this time, the door panel 24 of the temperature difference door 21 protrudes in the direction of the heater core 6 in contact with the upper end of the partition wall 15, and the opening 23 is located at the entrance of the branch passage 11. As a result, a relatively large amount of cool air C1 that has passed through the evaporator 5 is guided to the branch passage 11 through the opening 23 by the differential temperature door 21, and the inflow of the warm air W that has passed through the heater core 6 into the rear passage 13 is prevented. Therefore, the cold air C <b> 1 is sent to the rear outlet 12 via the rear passage 13. At the same time, the cold air C2 is mixed with the warm air W and sent to the vent outlet 9. As a result, the temperature of the cold air C1 at the entrance of the rear passage 13 is lower than that in the conventional case indicated by the broken line L1, as indicated by the solid line L7 in FIG. Next, while passing through the rear passage 13, the temperature of the cold air C1 rises as shown by the solid line L10 in FIG. 11A due to heat absorption, so that the temperature difference and the temperature difference of the cold air C2 blown out from the foot outlet 8 are reduced. .

  Further, during foot mode heating, as shown in FIG. 6, the opening / closing door 8a of the foot outlet 8 is opened, and the temperature difference door 21 is opened in conjunction therewith. At this time, the door panel 24 of the temperature difference door 21 rotates to a position substantially orthogonal to the partition wall 15, and a gap is formed between the temperature difference door 21 and the upper end of the partition wall 15. As a result, the door panel 24 of the temperature difference door 21 projects toward the heater core 6, so that the warm air W1 is guided to the rear passage 13 by the door panel 24 and the inflow of the cold air C to the rear passage 13 is suppressed. After the warm air W1 is introduced into the branch passage 11 along the differential temperature door 14, it is sent out to the rear outlet 12 via the rear passage 13. At the same time, the warm air W2 is mixed with the cold air C and sent to the foot outlet 8. As a result, the temperature of the warm air W1 passing through the inlet of the rear passage 13 is higher than that in the conventional case indicated by the broken line L1, as indicated by the solid line L9 in FIG. Next, while passing through the rear passage 13, the temperature of the warm air W1 decreases as shown by the solid line L10 in FIG. Get smaller.

  Even in the second embodiment configured as described above, the conditioned air having a small temperature difference from the front part of the passenger compartment 2 can be blown out to the rear part of the passenger compartment 2 and the comfort at the rear part of the passenger compartment 2 is improved. Can do.

  Further, the temperature difference door 21 may be the air mix door 7 without interlocking with the open / close doors 8a and 9a. Thus, air-conditioning air having a small temperature difference from the entire passenger compartment can be blown out at the rear of the passenger compartment in accordance with the adjustment of the outlet temperature regardless of the outlet mode. At this time, even if the opening degree of the air mix door 7 and the differential temperature door is switched between opening and closing as shown in FIG. 10A, the opening degree of the differential temperature door 21 is changed in conjunction with the opening degree of the air mix door. Also good.

  FIG. 12 is a longitudinal sectional view showing a vehicle air conditioner according to a third embodiment of the present invention, and FIG. 13 is a longitudinal sectional view showing a state in which foot mode heating is performed according to the third embodiment. In FIG. 12 and FIG. 13, the same components as those shown in FIGS. Although a part of the illustration is omitted in FIGS. 12 and 13, a rear passage 13 that guides the conditioned air to the rear outlet 12 is connected to the outlet of the branch passage 11.

  The vehicle air conditioner 30 of this embodiment is different in the configuration of the temperature difference door 31 from the first embodiment shown in FIGS. 1 to 4 described above, and the other configurations are basically the same. . That is, the temperature difference door 31 includes a rotary shaft 32 that is rotatably provided at the upper end of the partition wall 15, and a door panel 33 that is attached to the rotary shaft 32 and disposed at a predetermined distance from the rotary shaft 32. ing.

  In the second embodiment, for example, when the vent mode is cooled, the open / close door 9a of the vent outlet 9 is opened as shown in FIG. 12, and the door panel 33 of the temperature difference door 21 is inclined in conjunction with this. One end thereof is in contact with the instrument panel 3, and a relatively large amount of cool air C <b> 1 that has passed through the evaporator 5 can flow into the branch passage 11 through the gap between the door panel 33 and the rotating shaft 32. As a result, after the cold air C <b> 1 is introduced into the branch passage 11, it is sent out to the rear outlet 12 via the rear passage 13. At the same time, the cold air C2 is mixed with the warm air W and sent to the vent outlet 9. As a result, the temperature of the cold air C1 is lower at the inlet of the rear passage 13 than the cold air C2, but rises due to heat absorption while passing through the rear passage 13, so that the cold air C1 blown out from the rear outlet 12 As for the temperature, the temperature difference of the cold air C2 blown out from the vent outlet 9 becomes small.

  Further, during foot mode heating, the opening / closing door 8a of the foot outlet 8 is opened as shown in FIG. 13, and the door panel 33 of the temperature difference door 31 is rotated to a position where the partition wall 15 is substantially orthogonal. At this time, the cold air C1 that has passed through the evaporator 5 is suppressed from flowing into the branch passage 11 via the differential temperature door 31, while a part of the door panel 33 projects from the partition wall 15 toward the heater core 6. A relatively large amount of warm air W1 is introduced into the branch passage 11 by the door panel 24 and then sent out to the rear outlet 12 via the rear passage 13. At the same time, the warm air W2 is mixed with the cold air C and sent to the foot outlet 8. As a result, although the temperature of the warm air W1 is high at the entrance of the rear passage 13, it decreases due to heat dissipation while passing through the rear passage 13, so that the temperature of the warm air W1 when blowing out from the rear outlet 12 is The temperature and temperature difference of the cold air W2 blown out from the outlet 8 are reduced.

  Even in the third embodiment configured as described above, the conditioned air having a small temperature difference from the front part of the passenger compartment 2 can be blown out to the rear part of the passenger compartment 2 and the comfort at the rear part of the passenger compartment 2 is improved. Can do.

  The present invention can blow out conditioned air at the same temperature as the front part of the passenger compartment to the rear part of the passenger compartment, and thus has the effect of improving the comfort at the rear part of the passenger compartment. In addition, it can also be widely applied as an air conditioner for general machines or industrial machines.

1 is a longitudinal sectional view showing a vehicle air conditioner according to a first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the state which performs foot mode heating by 1st Embodiment. It is a figure which shows transition of the temperature of the conditioned air in the entrance of the rear channel | path provided in 1st Embodiment. It is a figure which shows transition of the temperature of the conditioned air in the exit of the rear channel | path provided in 1st Embodiment. It is a longitudinal cross-sectional view which shows the vehicle air conditioner which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which performs foot mode heating by 2nd Embodiment. It is a longitudinal cross-sectional view which shows the state which air-conditions in a defroster mode by 2nd Embodiment. It is a top view of the part of the temperature difference door seen from the A direction of FIG. It is a perspective view of a temperature difference door. It is a figure which shows the operating state of the temperature of the conditioned air in the entrance of the rear channel | path provided in 2nd Embodiment, and a differential temperature door. It is a figure which shows the operating state of the temperature of the conditioned air in the exit of the rear channel | path provided in 2nd Embodiment, and a differential temperature door. It is a longitudinal cross-sectional view which shows the vehicle air conditioner which concerns on the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which performs foot mode heating by 3rd Embodiment. It is a figure which shows transition of the temperature of the conditioned air in the entrance of the rear channel | path of the conventional vehicle air conditioner. It is a figure which shows transition of the temperature of the conditioned air in the exit of the rear channel | path of the conventional vehicle air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Car compartment 4 Air supply path 5 Evaporator 6 Heater core 7 Air mix door 8, 9, 10 Air outlet (front air outlet)
DESCRIPTION OF SYMBOLS 11 Branch passage 12 Rear blower outlet 13 Rear passage 14 Differential temperature door 15 Partition wall 20 Vehicle air conditioner 21 Differential temperature door 22 Rotating shaft 23 Opening part 24 Door panel 30 Vehicle air conditioner 31 Differential temperature door 32 Rotating shaft 33 Door panel

Claims (4)

A blower passage (4) connected to the blower for blower, an evaporator (5) provided in the middle of the blower passage (4) for cooling the air passing therethrough, and disposed on the downstream side of the evaporator (5). A heater core (6) for heating, and an air mix door (7) provided between the evaporator (5) and the heater core (6) for adjusting the ratio of the air volume passing through the heater core (6) and the air volume bypassed; A front air outlet (8, 9, 10) for blowing air from the air passage (4) to the front portion in the passenger compartment (2), and a rear passage (13) branched from the air passage (4) A vehicle air conditioner (1) comprising a rear outlet for blowing out the conditioned air sent through the rear passage (13) to the rear of the vehicle compartment (2),
A vehicle air conditioner (1) provided with a differential temperature door (14) for changing the amount of cold air introduced into the rear outlet (12) or the amount of hot air introduced in the middle of the air passage (4). ).   2. The vehicle air conditioner (1) according to claim 1, wherein the temperature difference door (14) is supplied to the rear passage (13) of warm air that has passed through the heater core (6) during vent mode cooling. A vehicle air conditioner (1) characterized by suppressing inflow and suppressing inflow of cold air that has passed through the evaporator (5) into the rear passage (13) during foot mode heating.   2. The vehicle air conditioner (1) according to claim 1, wherein the temperature difference door (14) guides the cool air that has passed through the evaporator (5) to the rear passage (13) during vent mode cooling. The vehicle air conditioner (1), wherein the warm air that has passed through the heater core (6) is guided to the rear passage (13) during foot mode heating. It is a vehicle air conditioner (1) of Claim 1, Comprising: The said temperature difference door (14) interlock | cooperates with the said air mix door (7), and the opening degree of the said air mix door (7) is predetermined. Hot air that has passed through the heater core (6) on the low temperature side below the reference opening is suppressed to the rear passage (13), and the opening of the air mix door (7) is on the high temperature side above the predetermined reference opening. A vehicle air conditioner (1) characterized in that the cool air that has passed through the evaporator (5) is suppressed to the rear passage side (13).

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